The Carboniferous Succession heloio the Coal- Measures. 399 



No. 4 (shale) was highly foasiliferous, and contained — 



Athyris planosulcata, Phill. Nuculana attenuata (Flem.). 



Lingula mytiloides, Sow. (elongate sp.). Parallelodon sp. 



Martinia glabra (Mart.). Posidoniella elongata (Phill.). 



Productus ci. semireticulatus (Mart.). Solenomya sp. 



AUorisma variabilis (?). Stroboceras hisulcata. 



Avicitlopecten dissimilis (Flem.). Straparollus sp. 



Lithodomits lingualis (Phill.). 



No. 1 (encrinital limestone) yielded — 



Amplexi-zaphrentis <p, Vaughan MS. { = Z. Bowerhanki, Thomp.). 



Ghfinetes papilionacea, Phill. 



Spirifer bisulcatus, Sow. (Common.) 



8. grandicostatus . 



8. integricostatm, Phill. 



8. cf. triangularis (Mart.). (Common.) 



8. trigonalis (Mart.), D'Orh. (Common.) 



(xxiii) Further west, at a quarry in white limestone, which is 

 worked in the wood near the summit of the hill east of the Logger- 

 heads Inn, the following list was obtained : — 



Dibunopkyllum ST^. Martinia glabra (Mart.). 



Syringopora cf. distans, Fischer. (Fairly Productiis Cora, D'Orh. 



common.) P. gig aniens (M.&ri.). (Not rare.) 



Athyris expansa, Phill. P. hemisphericus, (Common.) 



Pielasma hastata (Sow.). 



(xxiv) Crossing the Kiver Alyn to the east, near Llanferres, we 

 have a fine escarpment of the Carboniferous Limestone from the 

 700 feet contour-line to the 1,000 feet contour at Pant-du. Up this 

 gorge the beds can be seen to have a regular dip south-east at 17°. 

 At the bottom of the pass, near the river, the beds contain 

 Cyathophyllum Mnrcliisoni, E. & H., in abundance, and associated 

 with it Chonetes papilionacea, Phill., which is a large, convex, 

 fine-ribbed form, common at Cauldon Low, North Stafibrdshire. In 

 addition we collected — 



Alveolites septosa (Flem.). Productus Jimbriatus, Sow. 



Pibimophyllum sp. P. hemisphericus, J. Sow. 



Lithostrotion Martini, E. & H. Spiriferina cristata, Schloth. 

 Syritigopora cf . distans, Fischer. 



(xxv) Above Pot Holes the beds of limestone are thinner and 

 often cherty ; here we found — 



Campophyllum sp. X. Martini, E. & H. 



Lithostrotion irregulare (Phill.). Z. Portlocki (Bronn). 



■ (Large variety, very common.) Syringopora sp. 



L.junceum (Flem.). Productus gig anteus (Mart.). (Abundant.) 



And noted also beds of silicified Prodnctus giganteus (Mart.) and 

 crinoids similar to those occurring at Waenbrodlas. 



(xxvi) Limestones higlier in the series may be seen in the line of 

 small quarries on the east side of the road, and parallel to it, at 

 Gwyndy, where we obtained — 



Amplexi-zaphrentis <p, Vaughan MS. P. scabriculus (Mart.). 

 Prodnctvs longispinus, Sow. 8pirifer bisulcatus, Sow. 



P. punctalus (Mart.). 



